Methodology to develop design guidelines to construct unbound base course with reclaimed asphalt pavement (RAP)

2019 ◽  
Vol 223 ◽  
pp. 463-476 ◽  
Author(s):  
Saad Ullah ◽  
Burak F. Tanyu
Keyword(s):  
Asphalt Pavement ◽  
Design Guidelines ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Base Course

scholarly journals Evaluation performance of base course mixture containing reclaimed asphalt pavement (RAP)

2018 ◽  
Vol 162 ◽  
pp. 01037 ◽  
Author(s):  
Karim Al helo ◽  
Zaynab Qasim ◽  
Ahmed Majeed
Keyword(s):  
Asphalt Pavement ◽  
Stability Test ◽  
Reclaimed Asphalt Pavement ◽  
Test Results ◽  
Reclaimed Asphalt ◽  
Superpave Gyratory Compactor ◽  
Asphalt Mix ◽  
Asphalt Content ◽  
Base Course ◽  
Durability Performance

This paper presented the effect of addition of Reclaimed Asphalt Pavement (RAP) on performance of mixture with (20%, 30%, 40% and 50%) RAP as proportion of asphalt mix. To compare with virgin mixture marshall flow and stability test was used to evaluated durability performance with (0,1,3, and 7) days immersion and Wheel Truck test was used to evaluated the resist to rutting. The best gradation and optimum asphalt content was selected according to Superpave system. Superpave Gyratory Compactor (SGC) was used to compact mixture with 100-mm diameter. The test results indicated that addition of RAP to mixes showed significant increase on resistance of Durability and Rutting.

Construction Quality Control of Unbound Base Course using Light Weight Deflectometer where Reclaimed Asphalt Pavement Aggregate is Used as an Example

2020 ◽  
Vol 2674 (10) ◽  
pp. 989-1002
Author(s):  
Emre Akmaz ◽  
Saad Ullah ◽  
Burak F. Tanyu ◽  
Erol F. Guler
Keyword(s):  
Quality Control ◽  
Asphalt Pavement ◽  
Field Measurements ◽  
Design Criteria ◽  
Reclaimed Asphalt Pavement ◽  
Light Weight ◽  
Reclaimed Asphalt ◽  
Light Weight Deflectometer ◽  
Base Course ◽  
Unbound Aggregate

Reclaimed asphalt pavement (RAP) is already being recycled as a construction and building material. One of the commonly considered applications is to create an unbound aggregate from this material. However, since the particles of RAP have binder coatings, traditional quality control procedures applied during construction such as use of a nuclear density gauge does not provide accurate results. Therefore there is a need to find another method that can be applied during construction to confirm that the placement in the field meets the design criteria. For this reason, in this study, the suitability of using light weight deflectometer (LWD) has been investigated. The presented methodology outlines how to implement the use of LWD to create a target modulus in the laboratory as part of design criteria and compare with the field measurements. In the field, depending on the thickness of the constructed aggregate layer, the LWD measurements may be influenced by more than just the layer of interest. The presented methodology also provides a solution for such multilayer conditions. Although the study primarily focuses on using RAP as the investigated material, the methodology developed in this study can be applied to any type of unbound aggregate as demonstrated in this study.

scholarly journals Use of Reclaimed Asphalt Pavement in Conjunction with Ground Improvement: A Case History

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Kevin C. Foye
Keyword(s):  
Asphalt Pavement ◽  
Ground Improvement ◽  
Reclaimed Asphalt Pavement ◽  
Improvement Program ◽  
Laboratory Findings ◽  
Reclaimed Asphalt ◽  
Parking Lot ◽  
Base Course ◽  
Accepted Practice ◽  
Technical Construction

The use of Reclaimed Asphalt Pavement (RAP) in lieu of virgin crushed stone aggregate is becoming a widely accepted practice for a number of construction applications, particularly pavement base courses. A number of laboratory RAP studies have considered the mechanical properties of RAP bases in order to support pavement designs incorporating RAP. These studies have revealed a number of interesting relationships between RAP moisture content, compaction, and stiffness. This paper discusses the experiences of a design-build contractor integrating a geosynthetic ground improvement program with a RAP base during the reconstruction of a 1.95 ha asphalt parking lot. Field observations of base course construction with RAP explore some of the implications of laboratory findings. A number of interesting observations on the technical, construction, and economic issues resulting from the project challenges and the use of RAP are presented.

The Research of the Feasibility of Using Reclaimed Asphalt Pavement as a Material for Regenerated Low-Density Pervious Concrete

2013 ◽  
Vol 723 ◽  
pp. 703-710
Author(s):  
Sunn Jer Hwang ◽  
Chyi Sheu ◽  
Ying Wei Liu ◽  
Hsien Chou Chen
Keyword(s):  
Compressive Strength ◽  
Asphalt Pavement ◽  
Underground Water ◽  
Pervious Concrete ◽  
Reclaimed Asphalt Pavement ◽  
Low Density ◽  
Reclaimed Asphalt ◽  
Cement Binder ◽  
Strength Material ◽  
Base Course

The research is to compound (1) the Reclaimed Asphalt Pavement (RAP) with the asphalt penetration less than 15 (25°C, 5sec, 100g) and the gravel aggregates of the base course adopted from the existing roads, and (2) the cement binder into Regenerated Low-Density Pervious Concrete (RLDPC) whose the compressive strength is between 25 to 50 (kgf/cm2) and whose permeable capacity (ml/15sec) is greater than 600. The results show the RLDPC used as the pavement gravel gradation layer or as Controlled Low Strength Material (CLSM) that is more advantageous on (1) reducing the costs of re-filling pavement, (2) enhancing the durability of roads, and (3) increasing the flowing space of underground water.

Optimizing the Gradation of Fine Processed Reclaimed Asphalt Pavement and Aggregate Blends for Unbound Base Courses

2018 ◽  
Vol 2672 (52) ◽  
pp. 57-66 ◽  
Author(s):  
Saad Ullah ◽  
Burak F. Tanyu ◽  
Edward J. Hoppe
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Asphalt Pavement ◽  
Permanent Deformation ◽  
Mixture Design ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Grain Size Distributions ◽  
Base Course

The purpose of this research was to investigate the effect of changes in grain size distribution to the permanent deformation of two different fine processed reclaimed asphalt pavement (RAP) blended with base course virgin aggregate (VA). Grain size distribution of the RAP-VA blends were created following two different approaches. The first approach was based on mixing RAP and VA to have one grain size distribution, regardless of how much RAP was added to VA (here referred to as the engineered mixture design). The second approach was based on mixing RAP and VA with as-is gradation from the plants to proportions determined by weight and not controlling the outcome of the specific grain size of the mixture. This approach resulted in various grain size distributions (here referred as the as-is mixture design). The engineered mixture design was useful to quantify the effect of adding RAP to the blends, but was not a realistic approach to create blends that may be achieved in the field. The as-is mixture design could not only be achieved in the field, as demonstrated in this study, but also resulted in better performance in terms of permanent deformation. This manuscript describes the comparison of these two approaches and a methodology to optimize the gradation and develop thresholds for RAP-VA blends that may result in similar or better performance than the 100% as-is VA that is used to construct base course in pavement systems.

scholarly journals Influence of a Rejuvenator on Homogenization of an Asphalt Mixture with Increased Content of Reclaimed Asphalt Pavement in Lowered Technological Temperatures

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2567
Author(s):  
Pawel Slabonski ◽  
Beata Stankiewicz ◽  
Damian Beben
Keyword(s):  
Asphalt Pavement ◽  
Heavy Traffic ◽  
Effective Interaction ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Road Construction ◽  
Real Problem ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Base Course

The most technologically advanced form of road construction uses a high content of reclaimed asphalt pavement (RAP) as a component of its asphalt mixture (AM). However, there is a real problem with the effective interaction of RAP and MA. The research herein described presents an effective use of RAP originating from the recycling process of old pavements thanks to the application of an original rejuvenator. Two types of AM were designed concerning the base course of pavement as well as the wearing course and the binder course for various traffic categories. The achieved results show that the rejuvenator improved the homogenization of RAP with the asphalt binder and aggregate in each mixture type. On the basis of the research, the possibility of using paving AM with an increased content of RAP in lowered technological temperatures received a favorable assessment. Mixtures of asphalt concrete containing 40% RAP meet both Polish and German requirements for mixtures intended for heavy traffic pavements. Thanks to use of the rejuvenator, it is possible to compact AM layers containing RAP in a final compaction temperature lowered by about 20 °C. The achieved AM lab test results were confirmed on trial road sections. The rejuvenator used in tested AMs improved the homogenization of RAP with both binder and virgin aggregate. Moreover, the study proved that it is possible to use 20%, 40%, and even 100% RAP contents in the mixtures thanks to the use of the rejuvenator based on plant resin and the creation of conditions enabling the effective homogenization of AM components.

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